“You guys know I love a little friendly competition, and some of these questions were hilarious,” Kourtney, 36, captioned the video, which is labeled ‘Part I.’ “Watch the whole video to see who won this round, and be sure to check back soon for the next one!”

First up, the Keeping Up With the Kardashians stars were asked what Khloé’s favorite color is.

“I think everyone in the entire universe knows that answer,” Kourtney joked, as she wrote down “purple.”

When Kourtney was asked what age Khloé was when she lost her virginity, she simply responded, “I think it was 15.” Khloé stayed quiet, but confirmed the answer when she turned around her whiteboard, which she wrote “15” on.